Fan-blower



2 Sheets-Sheet 1'.

(No Model.)

A. H. BERRY.

FAN BLOWER.

Patented Oct. 4, 1887..

N1 PETERS. Photwu (No Model.)

2 sheets-fsheet 2.

A. H. BERRY. FAN BLOWER.

P E 7 T W 7 5 W mu PM m m .M P f 5 m P W 5 "RPM 9, 12. MM M w N UNITEDSTATES PATENT A. HUN BERRY, OF BOSTON, MASSACHUSETTS.

FAN-BLOWER.

SPECIFICATION forming part of Letters Patent No. 370,920, dated Dctoloere, 1887.

Application filed December 18, 1886. Serial No. 222,018. (No model.)

To all whom it may concern:

Be it known that I, A. HUN BERRY, a citizen of the United States,residing at Boston,

in the county of Suffolk and State of Massa' chusetts, have invented anew and useful Improvement in Fan-BloWers, of which the following is aspecification.

The object of my invention is to so construct, form, and arrange theblades of an air wheel or pump that in their rotation no counter orinterfering currents can have place, and that the wholeenergy of themachine can be devoted to moving a mass of air in the directionrequired. This object I attain by the mechanism shown in theaccompanying drawings, in which- Figure 1 is a perspective view showingone of my air-wheels complete; and Fig. 2 is a view in perspective, moreclearly showing the form and arrangement of one of the blades and itsconnection with the rim and hub. Fig. 3 is an elevation of the frontface of the wheel. Fig. 4. is an elevation'of the rear face of thewheel. Fig. 5 is a section through 3 z of Fig. 3. Fig. 6 is a section online U X, Fig. 5. Fig. 7 is a section on line V X, Fig. 5. Fig. 8 is asection on line S X, Fig. 5. Fig. 9 is a section on line F F, Fig. 5.

In the drawings, Fig. 1, I have shown the air-wheelwith five blades,although the number of blades may be varied to suit the particularconditions under which the device is to be used. That part of the wheelwhich serves as a frame-work for holding the blades consists of a hub,B. In this case said hub has five curved tangential faces, T T, to whichfaces the inner ends of the curved radial arms R R are attached by meansof bolts or other suitable fastenings. The outer ends of the radial armsR R are-secured to the rim A. In the wheel shown the radius of the armsR R is the same or about the same as that of the rim A.

The blade proper, G, is a compound warped surface having three edges,two of which, ddd eee, Fig. 2, are in the plane of the rim and radialarms R R,while the third edge, kklc is in a plane at about right anglesto the face of the wheel. The surface of the blades at the edges ddd eeeare made to fit the radial arms and the rim, and the edge kkk serves togather the air into the wheel. ddd, eee, and Ickk are connected by easycurves, which give to the body of the blade a warped or concavo-convexform, as shown in Figs. 6, 7, 8, and 9, which are sections drawn throughdifferent parts of the blade.

It will be seen upon inspection of Figs. 3 and tthat the outer portionof the blade from H to X is curved, beginning at the point H on thefront edge of the blade, tangent to an are described by the radius H L,thence curving backward to the pointX and meeting the rim of the wheel.Between the points H and is, Fig. 5, the curves of the blade all beginat the front edge, tangent to arcs described by radii from the axis ofthe wheel L, and, graduallychanging in curvature, at last coincide withthe circular rim of the wheel, which will be the are or circle describedby the radius of the wheel. Between H and P, Fig. 5, the curves are moreclearly shown by sections of one of the blades of my wheel taken on thelines U X, V X, S X, and F F, Fig. 5. The curves beginning at the pointsU, V, and S at the front of the blade are also tangent to arcs describedby radii from the axis of the wheel and curve to the rear to the commonpoint X,which is the point where the top edge, eee, and the rear edge,ddd, of the blade meet. Fig. 9 shows the curve of the blade on the lineF F,which is parallel to S X. The curves shown in Figs. 6, 7, 8, and 9are of a parabolic nature,with their vertices at the front of the blade,are of different degrees of curvature, and the uniting of them by curvedlines will make a blade which can be described as a compound warped orconcavoconvex form.

In my drawings I have shown the front or air-gathering edge, kkk", in aplane at right angles to the rear face of the wheel; but it may be madeat any angle by adding to or diminishing the distance between X and T,Fig. 3, as it may be desirable to diminish or increase the size of thepassage between the blades without changing the number of blades. Ineither The th ree edges case the front or air-gathering edge, Idck", of

the blade should be tangent to the circles of rotation of the said frontedge.

The shape of the gathering-edge of the blade kkkflviewed in profile, asin Fig. 5, is not material to the efficiency of the wheel, except as itwill give a larger or smaller area of inlet; but as viewed at rightangles to that position it is essential that this edge shall be at allpoints tangent to the circles of rotation or path described by thegathering-edge around the axis of the wheel, and not be merely at rightangles to the front of the blade, for if the distance from the point Jto X be diminished and the points 7; and 1? remain as they are shown thefront or gathering edge can be at right angles to the front of theblade, but it will be angular to its direction around the axis of thewheel and cause the blade to drag through the air. If the distance fromJ to X be increased, the points It and P remaining as they are shown,the edge can still be at right angles to the front of the blade. Thetendency then will be to deflect the air outward and away from thefollowing blade; but if the gathering-edge is tangential to itsdirection around the axis of the wheel the distance from J to X may beincreased or diminished, yet a cuttingedge will always be presented tothe air, thus causing the least disturbance, and the curved body of theblade will carry the air through the wheel without the violent changesof direction which have so retarding an effect on air in motion.

Having thus described my invention, whatl claim as new, and desire tosecure by Letters Patent, is I 1. A ventilating-Wheel having blades madefrom triangular blanks secured at two of their edges, and bentsubstantially as described, so that no part of their surface is plane.

2. A ventilating-wheel made up of blades having two edges secured in theplane of the rear face of the wheel, and bent substantially asdescribed, so that any line drawn upon the surface of the blade from therear to the front edge will be curved.

In testimony whcreofl have signed my name to this specification, in thepresence of two subscribing witnesses, on this 14th day of Decemher, A.D. 1886.

A HUN BERRY.

Witnesses:

FRANK G. PARKER, MATTHEW M. BLUNT.

